# Relationship history for MSHA mine 3002340

Current hierarchy: **Town Of Willet-Ny → Town Of Willet → Dunham'S Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Cortland County-Ny → Dunham'S Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cortland County Highway Department → Dunham'S Pit; 1979-01-01 to 1987-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Cortland County-Ny → Cortland County Highway Department; 1979-01-01 to 1987-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Town Of Willet → Dunham'S Pit; 1987-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Town Of Willet-Ny → Dunham'S Pit; 1987-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Willet-Ny → Town Of Willet; 1987-08-21 to current/open; source msha-controller-operator-history